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勾股定理证明
Author:
万超杰
GeoGebra
New Resources
異分母分數減法
兩位數除以一位數（二）
【案例】2018年全国1卷理科12题
找出對稱軸
畫出對稱圖形
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斜線
彈幕
蝴蝶定理（唐老师的课程）
matrix of rotation transformation
兩位數除以一位數（二）
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Volume
Plane Figures or Shapes
Polygons
Constructions
Statistical Characteristics